MERCRUISER 4.3, 5.0, 5.7, 6.2 HEAT EXCHANGER 864395T (no hose)

864395T MERCRUISER HEAT EXCHANGER (WITHOUT HOSE) REPLACEMENT

SUITS ENGINES:

350 MAG 6.2L HORIZON MPI MIE
350 MAG MX 6.2 HORIZON ALPHA AND BRAVO
357 HORIZON INBOARD REMAN AND BOBTAIL
383 MAG STROKER
4.3 CARB ALPHA AND BRAVO
4.3 MPI ALPHA AND BRAVO
5.0 MPI ALPHA AND BRAVO
5.0 MAG MPI 350 377 STERNDRIVE
5.7L MPI MIE
6.2L MPI MIE

*NOTE: There are two configurations. One with hose (864395T01) and one without (this one). See second photo for comparison. The hose sometimes gets in the way of the belt and pulleys. Click here for the version with hose.

As far as function:

  • WITH HOSE:  the hose drains a full surge tank into the inbound glycol circuit to the recirculating pump.   
    • There was an engineering change at Mercruiser a while back to add a hose that runs from the surge tank to the glycol / Fresh Water return fitting and it works great.  We think the hose may have been removed as part of a cost save.
  • WITHOUT HOSE: the glycol is drained from the surge tank (the upper tank in the pictures) via drains under the surge tank that you can't see

This is a non-OEM, aftermarket part by Mr. Cool (USA) 864395T.